Iditarod Geophysical Survey

The digital data below was produced from airborne geophysical surveys conducted in 2010 for the Iditarod survey area in the Innoko, Iditarod, and Ophir mining districts, Iditarod and Ophir quadrangles, western Alaska. Aeromagnetic and electromagnetic (EM) data were acquired by helicopter for about 852 sq miles. Fugro Airborne Survey's frequency-domain DIGHEM V system was used for the EM data. It includes (1) raw and processed linedata; (2) gridded, Google Earth, and Geotiff formats of the calculated linedata; (3) maps of the data; and (4) vector files of data contours and flight lines. A future publication will include the technical project report, interpretation map, and EM anomalies, as well as other files.

Available Data Metadata Overview
File Name Data File Format Download File Size
gpr2011-2_vectors Shapefile Download 87.7 M
gpr2011-4_vectors Shapefile Download 64.3 M
gpr2011-2_maps-HPGL2_1-5 Plot files Download 126.0 M
gpr2011-2_maps-HPGL2_6-8 Plot files Download 136.0 M
gpr2011-2_maps-HPGL2_9-13 Plot files Download 115.3 M
gpr2011-4_maps_hpgl2 Plot files Download 63.8 M
gpr2011-2_linedata-XYZ Line data XYZ files Download 273.0 M
gpr2011-2_linedata-GDB Line data GDB files Download 262.1 M
gpr2011-2_grids-GRD Gridded data Geosoft format Download 126.5 M
gpr2011-2_grids-ERS Gridded data ER Mapper Download 126.5 M
gpr2011-2_geotiffs-and-kmzs Georeferenced raster files Download 14.1 M
gpr2011-4_geotiffs Georeferenced raster files Download 36.6 M
gpr2011-2_maps-PDF Adobe PDF files Download 162.5 M
gpr2011-4_maps_pdf Adobe PDF files Download 38.8 M
gpr2011-4_project_report_em Adobe PDF files Download 6.5 M
gpr2011-4_sm_profiles Adobe PDF files Download 296.9 M


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  • GPR 2011-4. Iditarod survey area: Airborne magnetic and electromagnetic data in line, grid, vector, and map formats, and descriptive project report, Innoko, Iditarod, and McGrath mining districts, Iditarod and Ophir quadrangles, western Alaska.
  • GPR 2011-2. Iditarod survey area: Magnetic and electromagnetic line, grid, and vector data and maps, Innoko, Iditarod, and McGrath mining districts, Iditarod and Ophir quadrangles, western Alaska.